Question

43. In apple, the chromosome number of
gametes
is 17. What is the
chromosome number in its Primary
Endosperm Nucleus (PEN) ?
(A) 68
(B) 17
(C)
51
(D) 34​

Answer 1

Answer:

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Explanation:

The endosperm mother cell has two polar nuclei so it contains a total of 8 chromosomes. There are 7 cells in the embryo sac, one of which (the endosperm mother cell) contains 2 nuclei. The egg cell, 2 synergid cells and 3 antipodal cells each contain one nucleus with 4 chromosomes.

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Answer 2

The chromosome number in its Primary

Endosperm Nucleus (PEN) is - (C) 51

• Primary endosperm nucleus is formed by fusion of nucleus present in sperm with binucleate cell.
• The resultant is also known as secondary nucleus and is triploid in nature.
• Since the gamete contains 17 chromosomes, hence 17*3 = 51.
• Therefore, primary endosperm nucleus will have 51 chromosomes.
• The cell develops further to form endosperm which provides nourishment to the embryo.